util.c revision a5682f5243c3b36a55009c52d62edab683b28ccf
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* util.c contains a set of miscellaneous utility functions which:
* - syslog(LOG_DEBUG, ...) if debugging is enabled
* - check for an IP interface being marked running
* - look up all flags for an IP interface
* - start a child process
* - schedule a timer
* - check to see if a user is logged in to a graphical console
* - look up the zone name
*/
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include <string.h>
#include <strings.h>
#include <stropts.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <net/if.h>
#include <spawn.h>
#include <wait.h>
#include <inetcfg.h>
#include <utmpx.h>
#include <pwd.h>
#include <limits.h>
#include <errno.h>
#include <zone.h>
#include "defines.h"
#include "structures.h"
#include "functions.h"
#include "variables.h"
extern char **environ;
boolean_t debug = B_FALSE;
void
dprintf(const char *fmt, ...)
{
va_list ap;
char vbuf[1024];
va_start(ap, fmt);
if (debug) {
(void) vsnprintf(vbuf, sizeof (vbuf), fmt, ap);
syslog(LOG_DEBUG, "%d: %s", pthread_self(), vbuf);
}
va_end(ap);
}
boolean_t
is_plugged_in(struct interface *i)
{
if (i->if_type == IF_WIRELESS)
return (B_TRUE);
return ((get_ifflags(i->if_name, i->if_family) & IFF_RUNNING) != 0);
}
uint64_t
get_ifflags(const char *name, sa_family_t family)
{
icfg_if_t intf;
icfg_handle_t h;
uint64_t flags = 0;
(void) strlcpy(intf.if_name, name, sizeof (intf.if_name));
intf.if_protocol = family;
if (icfg_open(&h, &intf) != ICFG_SUCCESS)
return (0);
if (icfg_get_flags(h, &flags) != ICFG_SUCCESS) {
/*
* Interfaces can be ripped out from underneath us (for example
* by DHCP). We don't want to spam the console for those.
*/
if (errno == ENOENT)
dprintf("get_ifflags: icfg_get_flags failed for '%s'",
name);
else
syslog(LOG_ERR, "get_ifflags: icfg_get_flags %s af "
"%d: %m", name, family);
/* just to be sure... */
flags = 0;
}
icfg_close(h);
return (flags);
}
/*
*
* This starts a child process determined by command. If command contains a
* slash then it is assumed to be a full path; otherwise the path is searched
* for an executable file with the name command. Command is also used as
* argv[0] of the new process. The rest of the arguments of the function
* up to the first NULL make up pointers to arguments of the new process.
*
* This function returns child exit status on success and -1 on failure.
*
* NOTE: original_sigmask must be set before this function is called.
*/
int
start_childv(const char *command, char const * const *argv)
{
posix_spawnattr_t attr;
sigset_t fullset;
int i, rc, status, n;
pid_t pid;
char vbuf[1024];
vbuf[0] = 0;
n = sizeof (vbuf);
for (i = 1; argv[i] != NULL && n > 2; i++) {
n -= strlcat(vbuf, " ", n);
n -= strlcat(vbuf, argv[i], n);
}
if (argv[i] != NULL || n < 0)
syslog(LOG_ERR, "start_childv can't log full arg vector");
if ((rc = posix_spawnattr_init(&attr)) != 0) {
dprintf("posix_spawnattr_init %d %s\n", rc, strerror(rc));
return (-1);
}
(void) sigfillset(&fullset);
if ((rc = posix_spawnattr_setsigdefault(&attr, &fullset)) != 0) {
dprintf("setsigdefault %d %s\n", rc, strerror(rc));
return (-1);
}
if ((rc = posix_spawnattr_setsigmask(&attr, &original_sigmask)) != 0) {
dprintf("setsigmask %d %s\n", rc, strerror(rc));
return (-1);
}
if ((rc = posix_spawnattr_setflags(&attr,
POSIX_SPAWN_SETSIGDEF|POSIX_SPAWN_SETSIGMASK)) != 0) {
dprintf("setflags %d %s\n", rc, strerror(rc));
return (-1);
}
if ((rc = posix_spawnp(&pid, command, NULL, &attr, (char * const *)argv,
environ)) > 0) {
dprintf("posix_spawnp failed errno %d", rc);
return (-1);
}
if ((rc = posix_spawnattr_destroy(&attr)) != 0) {
dprintf("posix_spawn_attr_destroy %d %s\n", rc, strerror(rc));
return (-1);
}
(void) waitpid(pid, &status, 0);
if (WIFSIGNALED(status) || WIFSTOPPED(status)) {
i = WIFSIGNALED(status) ? WTERMSIG(status) : WSTOPSIG(status);
syslog(LOG_ERR, "'%s%s' %s with signal %d (%s)", command, vbuf,
(WIFSIGNALED(status) ? "terminated" : "stopped"), i,
strsignal(i));
return (-2);
} else {
syslog(LOG_INFO, "'%s%s' completed normally: %d", command, vbuf,
WEXITSTATUS(status));
return (WEXITSTATUS(status));
}
}
int
start_child(const char *command, ...)
{
const char **argv = NULL;
int argv_len = 0;
va_list ap;
int i = 1, rc;
va_start(ap, command);
do {
if (i >= argv_len) {
void *p;
argv_len = argv_len != 0 ? argv_len * 2 : 4;
p = realloc(argv, sizeof (*argv)*argv_len);
if (p != NULL) {
argv = p;
} else {
syslog(LOG_ERR, "Out of memory in start_child");
free(argv);
return (-1);
}
}
argv[i] = va_arg(ap, const char *);
} while (argv[i++] != NULL);
va_end(ap);
argv[0] = command;
rc = start_childv(command, argv);
free(argv);
return (rc);
}
uint32_t timer_expire = TIMER_INFINITY;
/*
* Schedules a SIGALRM in delay seconds, unless one is already
* scheduled sooner. If one is already scheduled later than
* delay seconds from now, that one will be replaced.
*/
void
start_timer(uint32_t now, uint32_t delay)
{
if (now + delay > timer_expire)
return;
timer_expire = now + delay;
(void) alarm(delay);
}
boolean_t
valid_graphical_user(boolean_t query)
{
struct utmpx *utp;
char *user = NULL;
const char HOMESTR[] = "HOME=";
char buf[1024]; /* == sysconf(_SC_GETPW_R_SIZE_MAX) == NSS_BUFSIZ */
static char home_dir[PATH_MAX + sizeof (HOMESTR)];
struct passwd passwd;
struct passwd *pw;
boolean_t popup_ok;
/*
* Check to see if our SMF property says popups are OK.
*/
if ((lookup_boolean_property(OUR_PG, query ? "popup_query" :
"popup_info", &popup_ok) == 0) && !popup_ok)
return (B_FALSE);
/*
* Look for someone logged into the console from host ":0" (i.e.,
* the X display. Down the road, we should generalize this so
* ":0" is not hard-coded. Note that the entry we want is usually
* an ordinary user process but sometimes if a session leader has
* exited, it can come from a DEAD_PROCESS, as is known to happen
* when the user logs in via gdm(1m).
*/
setutxent();
while ((utp = getutxent()) != NULL) {
if (((utp->ut_type == USER_PROCESS) ||
(utp->ut_type == DEAD_PROCESS)) &&
(strcmp(utp->ut_line, "console") == 0) &&
(strcmp(utp->ut_host, ":0") == 0)) {
user = strdup(utp->ut_user);
break;
}
}
endutxent();
dprintf("utmpx: done %s", user != NULL ? user : "");
if (user == NULL)
return (B_FALSE);
pw = getpwnam_r(user, &passwd, buf, sizeof (buf));
if (pw == NULL) {
syslog(LOG_ERR, "couldn't get user %s: %m", user);
free(user);
return (B_FALSE);
}
free(user);
/*
* We shouldn't be dumping this into our environment or changing
* our uid/gid but instead starting up the zenity processes with
* this display as this user. RFE to change this.
*/
(void) putenv("DISPLAY=:0.0");
(void) strlcpy(home_dir, HOMESTR, sizeof (home_dir));
(void) strlcat(home_dir, pw->pw_dir, sizeof (home_dir));
(void) putenv(home_dir);
return (pw != NULL);
}
void
lookup_zonename(char *zonename, size_t zonesize)
{
zoneid_t zoneid = getzoneid();
if (getzonenamebyid(zoneid, zonename, zonesize) >= 0)
return;
syslog(LOG_ERR, "could not determine zone name");
(void) strlcpy(zonename, GLOBAL_ZONENAME, zonesize);
}